Observational constraints on cosmic neutrinos and dark energy revisited
文献类型：期刊论文
| 作者 | Wang, X ; Meng, XL ; Zhang, TJ ; Shan, HY ; Gong, Y ; Tao, C ; Chen, XL ; Huang, YF |
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2012 |
| 期号 | 11 |
| 关键词 | MATTER POWER SPECTRUM HUBBLE-SPACE-TELESCOPE WEAK-LENSING SURVEYS OBSERVATIONS COSMOLOGICAL INTERPRETATION BARYON ACOUSTIC-OSCILLATIONS PROBE WMAP OBSERVATIONS LUMINOUS RED GALAXIES LARGE-SCALE STRUCTURE EQUATION-OF-STATE MASSIVE NEUTRINOS |
| ISSN号 | 1475-7516 |
| 通讯作者 | Wang, X (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China. |
| 英文摘要 | Using several cosmological observations, i.e. the cosmic microwave background anisotropies (WMAP), the weak gravitational lensing (CFHTLS), the measurements of baryon acoustic oscillations (SDSS+WiggleZ), the most recent observational Hubble parameter data, the Union2.1 compilation of type Ia supernovae, and the HST prior, we impose constraints on the sum of neutrino masses (Sigma m(v)), the effective number of neutrino species (N-eff) and dark energy equation of state (w), individually and collectively. We find that a tight upper limit on Sigma m(v) can be extracted from the full data combination, if N-eff and w are fixed. However this upper bound is severely weakened if N-eff and w are allowed to vary. This result naturally raises questions on the robustness of previous strict upper bounds on Sigma m(v), ever reported in the literature. The best-fit values from our most generalized constraint read Sigma m(v) = 0.556(-0.288)(+0.231) eV, N-eff = 3.839 +/- 0.452, and w = -1.058 +/- 0.088 at 68% confidence level, which shows a firm lower limit on total neutrino mass, favors an extra light degree of freedom, and supports the cosmological constant model. The current weak lensing data are already helpful in constraining cosmological model parameters for fixed w. The dataset of Hubble parameter gains numerous advantages over supernovae when w = -1, particularly its illuminating power in constraining N-eff. As long as w is included as a free parameter, it is still the standardizable candles of type Ia supernovae that play the most dominant role in the parameter constraints. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | NASA Office of Space Science; National Science Foundation of China [11173006]; Ministry of Science and Technology National Basic Science program (project 973) [2012CB821804]; Fundamental Research Funds for the Central Universities; Natural Science Foundation of China [11033002]; National Basic Research Program of China (973 Program) [2009CB824800] |
| 原文出处 | http://dx.doi.org/10.1088/1475-7516/2012/11/018 |
| 语种 | 英语 |
| WOS记录号 | WOS:000310833100018 |
| 公开日期 | 2014-04-25 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/15002]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | Wang, X,Meng, XL,Zhang, TJ,et al. Observational constraints on cosmic neutrinos and dark energy revisited[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(11). |
| APA | Wang, X.,Meng, XL.,Zhang, TJ.,Shan, HY.,Gong, Y.,...&Huang, YF.(2012).Observational constraints on cosmic neutrinos and dark energy revisited.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(11). |
| MLA | Wang, X,et al."Observational constraints on cosmic neutrinos and dark energy revisited".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .11(2012). |
入库方式： OAI收割
来源：理论物理研究所
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